Taking as its point of departure Jean-François Lyotard's inaugural argument concerning postmodernity in The Postmodern Condition: A Report on Knowledge, this article considers the character of postmodern thought, especially postmodern theoretical thought, and resistance to it, which has been and remains formidable. The article also offers an assessment of our theoretical thought now, thought after postmodern thought, as it moves from physics to justice, conjoined in my title. This conjunction is not so strange as it might appear. While we do customarily separate physics and justice, and have done so throughout modernity and then postmodernity, the relationships between them is unavoidable, beginning with the rise of modernity and the revolutionary developments in astronomy and physics that accompanied this rise. The article explores the profound significance of these relationships and their implications for thought and culture now, in the wake of postmodernity.